Can't install Service Pack 3

I downloaded Service Pack 3, clicked to install it, the install ran and at
the end it said " Expected version of the product was not found on your
system". Any advice?
--
mickey

Assuming you're referring to WinXP SP3 and attempted to install it manually:

Are you running WinXP SP1 or WinXP SP2 currently?

You are not offered the option to install Windows XP Service Pack 3 when you
use the Windows Update Web site or Automatic Updates:
http://support.microsoft.com/kb/955307

WinXP SP3 - Read all prerequisites for a successful installation
http://msmvps.com/blogs/harrywaldron...tallation.aspx

Steps to take before you install WinXP SP3
http://support.microsoft.com/kb/950717

Free unlimited installation and compatibility support is available for
Windows XP, but only for Service Pack 3 (SP3), until 14 Apr-09. Chat and
e-mail support is available only in the United States and Canada.

• US:
http://support.microsoft.com/oas/def...3&gprid=522131

• CA:
http://support.microsoft.com/oas/def...3&gprid=522131

• UK:
http://support.microsoft.com/oas/def...3&gprid=522131

• AU:
http://support.microsoft.com/oas/def...3&gprid=522131

• Other: http://support.microsoft.com/oas/def...spx?gprid=1173 | select
Windows XP | select Windows XP Service Pack 3

Is this Windows XP SP3 or Office XP SP3?
Plenty of info here:
http://www.google.co.uk/search?hl=en...e+Search&meta=

Service Pack 3 installation fails when trying to back up registry. I keep
getting the message: Could not backup registry key
HKLM\software\microsoft\windows\current version\uninstall\KB87339 Access
denied.
Can anyone help?

Error message when you try to install WinXP SP3: "Access is denied" or
“Service Pack installation did not complete”
http://support.microsoft.com/kb/949377

[Possible fix:
http://www.winhelponline.com/blog/re...n-windows-xp/]

How to troubleshoot an unsuccessful installation of WinXP SP3
http://support.microsoft.com/kb/950718

WinXP SP3 - Read all prerequisites for a successful installation
http://msmvps.com/blogs/harrywaldron...tallation.aspx

Free unlimited installation and compatibility support is available for
Windows XP, but only for Service Pack 3 (SP3), until 14 Apr-09. Chat and
e-mail support is available only in the United States and Canada. Go to
http://support.microsoft.com/oas/def...spx?gprid=1173 | select "Windows

Everything seems to be working fine until this point in the intallation:

152.531: Conditional load of section Netfx.CopyAlways.Condition succeeded
152.531: CheckRegistryValue: RegOpenKeyEx for System\WPA\Starter KeyName
failed :0x2
154.234: ArchiveFilesFromArchiveFilesSections:FindFirstFile for
C:\WINDOWS\System32\spool\DRIVERS\W32X86\3\*.BUD Failed: 0x2
154.234: PruneCatalogsFromHotfixes:RegQueryValueEx Failed: 0x2
154.234: PruneCatalogsFromHotfixes:RegQueryValueEx Failed: 0x0
154.437: PruneCatalogsFromHotfixes:RegQueryValueEx Failed: 0x2
154.516: PruneCatalogsFromHotfixes:RegQueryValueEx Failed: 0x2
154.781: PruneCatalogsFromHotfixes:RegQueryValueEx Failed: 0x2
154.812: PruneCatalogsFromHotfixes:RegQueryValueEx Failed: 0x2
154.922: PruneCatalogsFromHotfixes:RegQueryValueEx Failed: 0x2
154.953: PruneCatalogsFromHotfixes:RegQueryValueEx Failed: 0x2
155.031: PruneCatalogsFromHotfixes:RegQueryValueEx Failed: 0x2
155.156: PruneCatalogsFromHotfixes:RegQueryValueEx Failed: 0x2
155.406: PruneCatalogsFromHotfixes:RegQueryValueEx Failed: 0x2
155.531: PruneCatalogsFromHotfixes:RegQueryValueEx Failed: 0x2
155.594: PruneCatalogsFromHotfixes:RegQueryValueEx Failed: 0x2
156.016: PruneCatalogsFromHotfixes:RegQueryValueEx Failed: 0x2
156.047: PruneCatalogsFromHotfixes:RegQueryValueEx Failed: 0x0
156.047: PruneCatalogsFromHotfixes:RegQueryValueEx Failed: 0x0
156.047: PruneCatalogsFromHotfixes:RegQueryValueEx Failed: 0x0
156.109: PruneCatalogsFromHotfixes:RegQueryValueEx Failed: 0x2
156.234: PruneCatalogsFromHotfixes:RegQueryValueEx Failed: 0x0
156.266: PruneCatalogsFromHotfixes:RegQueryValueEx Failed: 0x0
156.266: PruneCatalogsFromHotfixes:RegQueryValueEx Failed: 0x0
156.266: PruneCatalogsFromHotfixes:RegQueryValueEx Failed: 0x0
156.266: PruneCatalogsFromHotfixes:RegQueryValueEx Failed: 0x0
156.266: PruneCatalogsFromHotfixes:RegQueryValueEx Failed: 0x0
156.266: PruneCatalogsFromHotfixes:RegQueryValueEx Failed: 0x0
156.266: PruneCatalogsFromHotfixes:RegQueryValueEx Failed: 0x0
156.266: PruneCatalogsFromHotfixes:RegQueryValueEx Failed: 0x0
156.266: PruneCatalogsFromHotfixes:RegQueryValueEx Failed: 0x0
156.266: PruneCatalogsFromHotfixes:RegQueryValueEx Failed: 0x0
156.266: PruneCatalogsFromHotfixes:RegQueryValueEx Failed: 0x0
156.266: PruneCatalogsFromHotfixes:RegQueryValueEx Failed: 0x0
156.266: PruneCatalogsFromHotfixes:RegQueryValueEx Failed: 0x0
156.266: PruneCatalogsFromHotfixes:RegQueryValueEx Failed: 0x0
156.266: PruneCatalogsFromHotfixes:RegQueryValueEx Failed: 0x0
156.266: PruneCatalogsFromHotfixes:RegQueryValueEx Failed: 0x0
156.266: PruneCatalogsFromHotfixes:RegQueryValueEx Failed: 0x0
156.266: PruneCatalogsFromHotfixes:RegQueryValueEx Failed: 0x0
156.266: PruneCatalogsFromHotfixes:RegQueryValueEx Failed: 0x0
156.266: PruneCatalogsFromHotfixes:RegQueryValueEx Failed: 0x0
156.266: PruneCatalogsFromHotfixes:RegQueryValueEx Failed: 0x0
156.266: PruneCatalogsFromHotfixes:RegQueryValueEx Failed: 0x0
156.266: PruneCatalogsFromHotfixes:RegQueryValueEx Failed: 0x0
156.266: PruneCatalogsFromHotfixes:RegQueryValueEx Failed: 0x0
156.266: PruneCatalogsFromHotfixes:RegQueryValueEx Failed: 0x2
248.156: Num Ticks for Backup : 114515
248.734:
AppPatch not installed.
248.734: AppPatch not installed. Registry will be archived.
274.203: Message displayed to the user: Service Pack 3 Setup could not
backup registry key
HKLM\Software\Microsoft\Windows\CurrentVersion\Uninstall\KB873339
to file C:\WINDOWS\$NtServicePackUninstall$\reg02314. 5: Access is denied.
274.203: User Input: ABORT